For many years my father, a veteran instructor, flew C150s etc from an airport which had a runway circa 7,500 feet long. Light aircraft would "normally" depart from an intersection which gave about 4,500 feet as the traffic was mixed and there was only one taxiway to the end of the runway and this practice was to avoid conflicts with IFR scheduled traffic on slot times etc.
For him this was a big compromise as he believed in always using the longest possible run into or near wind.
However for night flying he always insisted on full length.
Remember well sitting in the flying school having a cuppa to hear the engine of the a/c he was flying come to an abrupt stop. About 100 feet after take off the engine failed completely (I think a cylinder had blown off or some such thing) and he easily landed back on the runway with room to spare but if the intersection departure had been used he would have been off airport.